<template>
  <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import * as echarts from 'echarts'
require('./spider') // echarts theme
import { debounce } from '@/utils'

const animationDuration = 6000

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    },
    optionTitleText: {
      type: String,
      default: ''
    },
    opinionDatasetDimensions:{
      type: Array,
      default: []
    },
    opinionDatasetSource:{
      type: Array,
      default: []
    },
  },
  data() {
    return {
      chart: null,
      opinion:{
        title: {
          text: this.optionTitleText,
          padding: 10,
        },
        backgroundColor: '#fff',
        grid: {
          top: 60,
          left: '2%',
          right: '2%',
          bottom: '3%',
          containLabel: true
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: { // 坐标轴指示器，坐标轴触发有效
            type: 'shadow' // 默认为直线，可选为：'line' | 'shadow'
          }
        },
        legend: {},
        dataset: {
          dimensions: this.opinionDatasetDimensions,
          source: this.opinionDatasetSource
        },
        xAxis: {type: 'category'},
        yAxis: {},
        // Declare several bar series, each will be mapped
        // to a column of dataset.source by default.
        series: [
          {type: 'bar',barMaxWidth:50,itemStyle: {
              color: 'green' // 设置第一个 bar 的颜色为红色
            }},
          {type: 'bar',barMaxWidth:50,itemStyle: {
              color: 'red' // 设置第二个 bar 的颜色为红色
            }},
          {type: 'bar',barMaxWidth:50,itemStyle: {
              color: 'gray' // 设置第三个 bar 的颜色为红色
            }}
        ]
      }
    }
  },
  watch:{
    opinionDatasetDimensions(newValue,oldValue){
      this.opinion.dataset.dimensions=newValue
      this.chart.setOption(this.opinion);
    },
    opinionDatasetSource(newValue,oldValue){
      this.opinion.dataset.source=newValue
      this.chart.setOption(this.opinion);
    },
    optionTitleText(newValue,oldValue){
      this.opinion.title.text=newValue
      this.chart.setOption(this.opinion);
    },
  },
  mounted() {
    this.initChart()
    this.__resizeHandler = debounce(() => {
      if (this.chart) {
        this.chart.resize()
      }
    }, 100)
    window.addEventListener('resize', this.__resizeHandler)
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    window.removeEventListener('resize', this.__resizeHandler)
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'spider')
      this.chart.setOption(this.opinion)
    }
  }
}
</script>
